Improvement in brakes for elevators



W. F. HEALY &. J. BEGGS.

BRAKES FOR, ELEVATORS.

No. 195,1z4 Patented Sept'.11,1877;

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UNITED WILLIAM F. HEALY AND JAMES BEGGS, OF PATERSON, NEW JERSEY.

IMPROVEMENT IN BRAKES FOR ELEVATORS.

Specification forming part of Letters Patent No. 195.12% dated September11, 1877 application filed August 1, 1877.

To all whom it may concern:

Be it known that we, WILLIAM F. H EALY and JAMES BEGGS, of Paterson, inthe county of Passaic and State of New Jersey, have invented anImprovement in Brakes for Elevators, of which the following is aspecification:

Brakes that are employed with passenger and freight elevator-engines areusually provided with a steel band that passes around a drum or pulleythat is of smaller diameter than the main drum; and, in addition to thewear resulting from the contact of the band with the drum, there is arisk of the band becoming loose and inoperative or breaking.

Our improvement relates to a friction-clamp applied at each edge of themain drum, said clamp being composed of levers operated by toggle-barsor other well known mechanical contrivance, so that a positiveholding-force is brought-to hear at each edge of the drum, withoutstraining the shaft or bearings; and we also arrange a weighted lever,chain, and pulley, in connection with the main lever and stopping andstarting rope, so that the weight will be relieved from the brake whenthe lever is moved either above or below the horizontal position, andthereby relieve the wheel from the brake, whether the engine is hoistingor lowering the load.

In the drawing, Figure l is a side elevation of the hoisting machinery,and Fig. 2 is a cross-section of the band-wheel and the brakeblocks.

The engine a, crank-shaft b, band-pulley c, tightener d, and mainband-wheel e are of usual character, except that the edges of theband-Wheel e a ,.alar $l tam g a ped by the bfike-blocksl, anTF forthlSlllLTM is preferable to groove each edge of the ban w ee and toemploy V-shaped ribs upon the f%es of the brake-blocks to fit suchgrooves. -The brake-blocks f are upon levers g, m at the opposite endsthere are toggle-links h that are pivoted to the respective levers g andconnected to the weighted lever I, so that when the weight I is allowedto act upon this lever l the toggle-links will be drawn or forced, andact through the levers g and brake-blocks to grasp both edges of thebandwheel, and hold the same and the load at the required position.

The ordinary hand-rope passing vertically in the elevator-well, and bywhich the engine is stopped and started, is connected with the mainlever m, upon the fulcrum n, and the said lever serves to stop, start,and reverse the engine in any desired manner, the horizontal position ofthe lever being that at which the engine is stopped and the brakeapplied; and when the lever is raised the engine is caused to revolve inone direction, and when this lever m is depressed the engine is revolvedin the other direction.

From the lever m a chain or rope, 0, passes down to the weight l, sothat said weight is raised with the upward movement of this lever m asthe engine is started, so as to take ofi the brake from the band-wheel;and there is another chain, 8, passing up from the lever m, over thepulley 1', and down again to the weight I, so that the weight Z is alsolifted when the lever m is depressed below the horizontal line inreversing the motion of the engine.

A lever might take the place of the pulley r, the chain 8 being attachedat each end.

We do not claim operating the brake-lever by a connection to thestopping and starting lever; neither do we claim brake-blocks acting atopposite edges of the wheel.

We claim as our invention '1. The combination, with the band-wheel inthe elevating apparatus, of the brake-blocks f, acting at opposite edgesof the bandwheel, the levers g, toggle-bars h, lever l, and weight Z,substantially as set forth.

2. In combination with the main lever m and weigh ted brake-lever Z Z,the chains 0 and s and pulley 4", arranged and operating substantiallyas set forth.

Signed by us this 18th day of July, A. D. 1877.

W. F. HEALY. JAMES BEGGS.

Witnesses WM. H. HAYES, Geo. S. OHIswELL.

